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See https://en.wikibooks.org/wiki/LaTeX/Bib ... ny_output? for information about warnings like

Hi,

I had the same problem . This is what solved it.
I was having entries like the one below:

@ARTICLE{gasTurbineCombustor_GeneralMotors_AIAA}
AUTHOR = {N.K.Rizk , H.C.Mongia},
TITLE = {Gas Turbine combustor performance evaluation},
YEAR = {1991},
JOURNAL = {29^{th } Aerospace sciences ...